EP2377682B1 - Method for producing a multi-layer packaging film - Google Patents

Method for producing a multi-layer packaging film Download PDF

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Publication number
EP2377682B1
EP2377682B1 EP10004045.0A EP10004045A EP2377682B1 EP 2377682 B1 EP2377682 B1 EP 2377682B1 EP 10004045 A EP10004045 A EP 10004045A EP 2377682 B1 EP2377682 B1 EP 2377682B1
Authority
EP
European Patent Office
Prior art keywords
film
layer
adhesive
tear line
polyolefin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10004045.0A
Other languages
German (de)
French (fr)
Other versions
EP2377682A1 (en
Inventor
Matthias Perick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mondi Consumer Packaging International AG
Original Assignee
Mondi Consumer Packaging International AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mondi Consumer Packaging International AG filed Critical Mondi Consumer Packaging International AG
Priority to ES10004045.0T priority Critical patent/ES2643553T3/en
Priority to EP10004045.0A priority patent/EP2377682B1/en
Publication of EP2377682A1 publication Critical patent/EP2377682A1/en
Application granted granted Critical
Publication of EP2377682B1 publication Critical patent/EP2377682B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5827—Tear-lines provided in a wall portion
    • B65D75/5833—Tear-lines provided in a wall portion for tearing out a portion of the wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2575/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D2575/52—Details
    • B65D2575/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D2575/586—Opening or contents-removing devices added or incorporated during package manufacture with means for reclosing

Definitions

  • the invention relates to a method for producing a multilayer packaging film which can be torn open along a weakening line with the release of a strip-shaped adhesive surface.
  • the strip-shaped adhesive surface forms a reclosure.
  • the packaging film may in particular for packaging for wet wipes, z. B. lotioned hygiene, cosmetic or cleaning wipes are used.
  • wet wipes are kept ready in foil packaging, from which they can be removed individually.
  • the wet wipes are usually folded overlapping, so that by the removal of a wet wipe and the beginning of the following cloth is pulled out.
  • self-adhesive labels are applied to the packaging, which cover a tear region of the package and after the first opening of the packaging reclosure of the removal opening allow ( EP 0 030 348 B1 . WO 96/11147 A1 ).
  • Out EP 1 449 789 B1 is a packaging film is known, which can be torn along a line of weakness to release a strip-shaped adhesive surface.
  • the exposed adhesive surface is used as a reclosure used.
  • the packaging film consists of an inner film forming the inner side of the package, which is provided with a first line of weakness defining the tear opening, and an outer film having a second line of weakness.
  • the two lines of weakness are laterally offset from each other, with the second line of weakness surrounding the first line of weakness.
  • the films are coated with a pressure-sensitive adhesive, for. As an acrylate adhesive, releasably connected. In the remaining area, the two films are covered by a permanent adhesive, for. B.
  • the inner film is separated at the first weakening line and the outer film is separated at the second weakening line. Since the opening surface of the inner film is connected via the permanent adhesive with the outer film, the removal opening is released when lifting the film section.
  • the reclosability results from the arrangement of the pressure-sensitive adhesive whose width corresponds to the distance between the first line of weakness and the second line of weakness.
  • the process for producing the packaging films is expensive. First, the inner film is partially coated with pressure-sensitive adhesive, which is applied in a strip-shaped pattern. The coated film passes through a drying oven and is then provided in a subsequent cutting station with a line of weakness that surrounds the tear opening.
  • a second film is provided, to which a permanent adhesive is also applied in a pattern.
  • the coated film passes through a drying station and is also provided in a subsequent cutting station with a line of weakness, which form the second line of weakness of the packaging film.
  • the film webs must then be accurately merged and joined together, with the exact Care must be taken to match the line of weakness and the areas coated with different adhesives.
  • WO 2008/115693 A1 describes a method for producing reclosable openings in films, in which first a first film is cut and provided with lines of weakness, in a second step, a pressure sensitive adhesive is applied in a pattern, then also in a pattern adhesive for permanent lamination is applied, after which first film is connected to a second film and finally the second film is provided with cuts and lines of weakness.
  • EP 1 849 579 A1 For example, a method is disclosed for making tear-open packages having a line of weakness.
  • a weakening line is generated by means of a laser beam.
  • the US 2006/200107 A1 relates to a resealable package for a plurality of disposable diapers whose reclosure system is associated with the wrapper of the package.
  • the invention is based on the technological problem of simplifying the process for producing a multilayer packaging film which can be torn open along a weakening line with the release of a strip-shaped adhesive surface.
  • a multilayer film is first prepared, which has an outer layer, a sealing layer for the packaging inside and between the two layers at least one having a single-layer functional layer of a pressure-sensitive adhesive.
  • sections of the weakening line are then introduced into the prefabricated film, subsequently to the upper side of the film and to the underside of the film, which are laterally offset from one another and extend from the upper side of the film or the lower side of the film to the functional layer.
  • the lateral offset of the weakening line portions emanating from the film top or film bottom determines the width of the reusable sticky strip which is exposed when the packaging film is torn open along the line of weakness.
  • the line of weakness is applied in a pattern that forms a tear tab.
  • the first section of the weakening line emanating from the sealing layer is surrounded by a second weakening line section, which starts from the opposite side of the film.
  • the functional layer consisting of a pressure-sensitive adhesive is introduced or arranged over its entire area between adjacent film layers and extends without interruptions over the entire length and width of the packaging film.
  • the lines of weakness extending from the upper side of the film and lower side of the film extend into the region of the functional layer and end there within the functional layer or at an interface between the functional layer and an adjacent film layer.
  • Suitable pressure-sensitive adhesives for the functional layer are, in particular, acrylate adhesives, SB copolymers (SBS, SIS, SEBS), silicone rubber adhesives, natural rubber adhesives, polyisobutylene and EVA.
  • the multilayer film can consist of a coextrusion film, wherein the outer layer of the coextrusion film can be printed and coated with a protective lacquer. In the printed and provided with the protective varnish multilayer film then the weakening line sections are introduced.
  • the sealing layer and the outer layer of the coextruded film are preferably made of polyolefin layers.
  • a multilayer film is produced and used which has an intermediate layer between the outer layer and the sealing layer, wherein the functional layer is arranged between the intermediate layer and the sealing layer.
  • the intermediate layer and the sealing layer are preferably made of polyolefin layers.
  • the Fig. 1 shows a multilayer packaging film which can be torn along a line of weakness 1 to release a strip-shaped adhesive surface 2.
  • the strip-shaped adhesive surface 2 allows a reclosure of the film.
  • a multilayer film is first produced which, according to the illustrations in FIG Fig. 2 to 8 an outer layer 3 which is suitable as a packaging outside and is usually printed, a sealing layer 4 for the inside of the packaging and between the two layers has an at least single-layer functional layer 6 made of a pressure-sensitive adhesive 16.
  • the print is in the Fig. 2 has been shown schematically as a color layer 7.
  • the outer layer 3 and the sealing layer 4 are preferably made of polyolefinic layers.
  • the multilayer film between the outer layer 3 and the sealing layer 4 has an intermediate layer 5 which, like the sealing layer 4, preferably consists of a polyolefinic layer.
  • the functional layer 6 is arranged between the intermediate layer 5 and the sealing layer 4.
  • the outer layer 3 may be made of, for example, a polyethylene terephthalate (PET), oriented polypropylene (OPP, BOPP), oriented polyamide (OPA), and the like.
  • the outer layer 3 may be printed on the outside or printed inversely on the inside. The print is in the Fig. 2 to 7 has been shown schematically as a color layer 7. As outer layer 3 is also a protective varnish into consideration.
  • the polyolefinic layers 4, 5 consist for example of polyethylene or polypropylene.
  • Acrylic adhesives, styrene-butadiene copolymers, adhesives based on a silicone rubber, natural rubber and also sticky polymers such as polyisobutylene can be used as the pressure-sensitive adhesive 16 for the functional layer 6.
  • Other self-adhesive and familiar to the expert adhesive resins should not be excluded.
  • the line of weakness 1 is introduced by punching or by means of a laser technology on the upper side of the film and on the underside of the film, which are laterally offset by the dimension a and extend from the top of the film or the film bottom to the functional layer 6.
  • the representation in Fig. 1 if one deduces that the weakening line 1 is applied in a pattern which forms a tear-open tab.
  • a first section 9 of the weakening line extending from the sealing layer (lower side of the film) is surrounded by a second weakening line section 9 which extends from the opposite side of the film composite.
  • the distance a between these two weakening line sections 8, 9 defines the width of the adhesive surface 2 which is released when the packaging film is torn open.
  • a multi-layer coextrusion film 10 having two polyolefinic layers 3, 4 and a functional layer 6 arranged between these two layers of a pressure-sensitive adhesive 16 is produced.
  • the outer layer 3 of the coextrusion film is printed (ink layer 7) and coated with a protective lacquer 18.
  • weakening line sections 8, 9 are introduced, which extends from the top of the film or the film bottom, each extending to the functional layer 6.
  • the weakening line sections 8, 9 terminate at the interface between the functional layer 6 and the inside of the package They can also end within the functional layer 6 or overlap in the vertical direction.
  • a coextrusion film 10 having two polyolefinic layers 4, 5 and a functional layer 6 of a pressure-sensitive adhesive 16 arranged between the two polyolefin layers 4, 5 is likewise produced.
  • the coextrusion film 10 is further processed into a film composite, into which weakening line sections 8, 9 are then introduced, which each extend from the upper side of the film or the underside of the film up to the functional layer 6.
  • the weakening line sections 8, 9 terminate at the interface between the functional layer 6 and the sealing layer 4 forming the packaging inside.
  • the weakening line sections 8, 9 can also terminate within the functional layer 6 or can also overlap in the vertical direction.
  • the introduced in the film bottom weakening line section 9 extends to the interface between the functional layer 6 and the polyolefinic intermediate layer 5, while the outgoing from the film top weakening line section 8 as shown in FIG Fig. 3 extends to the interface between the functional layer 6 and the lower sealing layer 4.
  • the outer film 17 is printed on the inside inverse in the embodiment.
  • the inverse imprint was shown as a color layer 7. That on the basis of Fig. 3 described method can be carried out particularly easily and requires, for example, for the application of the functional layer 6 no special application equipment.
  • packaging film is first produced by blown film extrusion at least a two-layer film tube, having an outer polyolefinic layer and an inner layer of a pressure-sensitive adhesive 16 or a polymer having tacky properties.
  • the inner layer of the film tube consists for example of metallocene PE, ie a polyethylene produced using metallocene catalysts, or EVA.
  • the film tube is folded together to form a multilayer flat film 11 which has outer polyolefinic layers 4, 5 as well as a two-layer functional layer 6 consisting of pressure-sensitive adhesive 16.
  • the flat film 11 is further processed by laminating a film 17 forming the outer layer 3 to form a film composite into which the weakening line sections 8, 9 are then introduced, which each extend from the lower side of the film or the upper side of the film to the functional layer 6.
  • the weakening line sections 8, 9 terminate within the functional layer 6, preferably at the interface formed by laying flat of the film tube.
  • the outer film 17, which may consist of PET or BOPP, for example, can be printed on the outside.
  • the film 17 to be laminated has been printed inversely on its inner surface facing the multilayer flat film 11.
  • the printed image is shown schematically as a color layer 7.
  • the tearing behavior of the packaging film can be further improved if strips of a diene finish 12 are printed on a film surface adjoining the functional layer 6 in a pattern adapted to the course of the subsequently produced weakening line 1.
  • a Denosivlack which is also referred to in practice as a release liner
  • PA systems, 2K-acrylate systems, silicone and PVC systems can be used.
  • the application of the Denosivlacks 12 can be considered in the context of the method according to the invention in various ways. The methods are described below on the basis of Fig. 5 to 8 explained.
  • two coextrusion films 13, 13 'are produced which have on their one side a sealable polyolefin layer 4, 5 and on their other side a layer of a functional adhesive 6 forming the functional layer 6.
  • On one of the two coextrusion films 13, 13 'strips of a Dephasesivlack 12 are printed in a pattern that is adapted to the course of the weakening line 1 generated later.
  • the application of the adhesive varnish 12 takes place on the existing of the pressure-sensitive adhesive 16 layer of the selected coextrusion film 13, 13 '.
  • the laminate 14 is further processed by laminating a film 17 forming the outer layer 3 to form a film composite into which the weakening line sections 8, 9 are then introduced, which each extend from the upper side of the film or the lower side of the film to the functional layer 6.
  • the representation in Fig. 5 If one assumes that the outgoing of the film top and the film bottom portions 8, 9 of the weakening line 1 to each other so that the weakening line sections 8, 9 are substantially adjacent to the edges of the existing of the Descosivlack 12 strips.
  • illustrated packaging film is prepared by coextrusion or in a laminating at least two-ply film material 15 having on one side of a polyolefin layer 5 and on its other side an outer side suitable as a packaging outer side 3.
  • On the polyolefin layer 5 of the film material 15 is then using a two-dimensionally applied pressure-sensitive adhesive 16 laminated on a polyolefinic sealing film 4, wherein on the inside of the sealing film 4 or on the polyolefin layer 5 of the film material 15 prior to the laminating strips of a Descosivlack 12 are printed.
  • the Descosivlack 12 is applied in a pattern that is adapted to the course of the weakening line 1 generated later.
  • the weakening line sections 8, 9 are introduced, which extend starting from the upper side of the film or the lower side of the film up to the pressure-sensitive adhesive 16 forming the functional layer 6.
  • the portions of the weakening line 1 emanating from the upper side of the film and the underside of the film are offset so that the sections 8, 9 of the weakening line 1 are substantially adjacent to the edges of the strips consisting of the adhesive enamel 12.
  • film is on the outside of the upper, z. B. made of PET or BOPP existing outer layer 3 printed.
  • the print shown as ink layer 7 can also be applied to the inside of the outer layer 3 forming film 17 as an inverse printed image.
  • the sealing film 4 is printed on its inner side facing the functional layer 6.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer mehrlagigen Verpackungsfolie, die entlang einer Schwächungslinie unter Freisetzen einer streifenförmigen Klebefläche aufgerissen werden kann. Die streifenförmige Klebefläche bildet einen Wiederverschluss. Die Verpackungsfolie kann insbesondere für Verpackungen für Feuchttücher, z. B. lotionsgetränkte Hygiene-, Kosmetik- oder Reinigungstücher verwendet werden.The invention relates to a method for producing a multilayer packaging film which can be torn open along a weakening line with the release of a strip-shaped adhesive surface. The strip-shaped adhesive surface forms a reclosure. The packaging film may in particular for packaging for wet wipes, z. B. lotioned hygiene, cosmetic or cleaning wipes are used.

Feuchttücher werden in Folienverpackungen bereit gehalten, aus denen sie einzeln entnommen werden können. Die Feuchttücher sind dabei üblicherweise überlappend gefaltet, so dass durch die Entnahme eines Feuchttuches auch der Anfang des nachfolgenden Tuches herausgezogen wird. Um nach der Entnahme eines Feuchttuches das Austrocknen der in der Verpackung verbleibenden Tücher zu vermeiden, werden auf die Verpackungen selbstklebende Etiketten aufgebracht, welche einen Aufreißbereich der Verpackung überdecken und nach der erstmaligen Öffnung der Verpackung einen Wiederverschluss der Entnahmeöffnung ermöglichen ( EP 0 030 348 B1 , WO 96/11147 A1 ).Wet wipes are kept ready in foil packaging, from which they can be removed individually. The wet wipes are usually folded overlapping, so that by the removal of a wet wipe and the beginning of the following cloth is pulled out. In order to avoid the drying of the remaining in the package after removal of a wet wipe, self-adhesive labels are applied to the packaging, which cover a tear region of the package and after the first opening of the packaging reclosure of the removal opening allow ( EP 0 030 348 B1 . WO 96/11147 A1 ).

Das nachträgliche Aufbringen eines großflächigen Haftetiketts verteuert die Verpackungen, die als Massenartikel sehr kostengünstig gefertigt werden müssen. Nachteilig ist auch, dass die Haftetiketten an der Beutelaußenseite überstehen, was das Stapeln, Handhaben, Transportieren und Abpacken der Beutel in größeren Gebinden erschwert.The subsequent application of a large-area adhesive label makes the packaging more expensive, which must be manufactured as a mass-produced very cost. Another disadvantage is that the adhesive labels survive on the outside of the bag, which makes it difficult to stack, handle, transport and pack the bags in larger containers.

Aus EP 1 449 789 B1 ist eine Verpackungsfolie bekannt, die entlang einer Schwächungslinie unter Freisetzen einer streifenförmigen Klebefläche aufgerissen werden kann. Die freigelegte Klebefläche wird als Wiederverschluss benutzt. Die Verpackungsfolie besteht aus einer die Verpackungsinnenseite bildenden inneren Folie, die mit einer die Aufreißöffnung begrenzenden ersten Schwächungslinie versehen wird, und einer äußeren Folie, die eine zweite Schwächungslinie aufweist. Die beiden Schwächungslinien sind seitlich zueinander versetzt angeordnet, wobei die zweite Schwächungslinie die erste Schwächungslinie umgibt. In einem streifenförmigen Bereich zwischen den beiden Schwächungslinien sind die Folien mit einem Haftklebstoff, z. B. ein Acrylatklebstoff, lösbar verbunden. Im übrigen Bereich sind die beiden Folien durch einen Permanentklebstoff, z. B. auf der Basis eines PU-Klebstoffes, trennfest miteinander verbunden. Beim Aufreißen der Verpackungsfolie erfolgt eine Trennung der inneren Folie an der ersten Schwächungslinie und eine Trennung der äußeren Folie an der zweiten Schwächungslinie. Da die Öffnungsfläche der inneren Folie über den Permanentklebstoff mit der äußeren Folie verbunden ist, wird beim Abheben des Folienabschnittes die Entnahmeöffnung freigegeben. Die Wiederverschließbarkeit ergibt sich durch die Anordnung des Haftklebstoffes, dessen Breite dem Abstand zwischen der ersten Schwächungslinie und der zweiten Schwächungslinie entspricht. Das Verfahren zur Herstellung der Verpackungsfolien ist aufwendig. Zunächst wird die innere Folie bereichsweise mit Haftklebstoff beschichtet, der in einem streifenförmigen Muster appliziert wird. Die beschichtete Folie durchläuft einen Trocknungsofen und wird dann in einer nachfolgenden Schneidstation mit einer Schwächungslinie versehen, welche die Aufreißöffnung umrandet. Zur Bildung der Außenschicht wird eine zweite Folie bereitgestellt, auf die ebenfalls in einem Muster ein Permanentklebstoff appliziert wird. Die beschichtete Folie durchläuft eine Trocknungsstation und wird in einer nachfolgenden Schneidstation ebenfalls mit einer Schwächungslinie versehen, welche die zweite Schwächungslinie der Verpackungsfolie bilden. Die Folienbahnen müssen anschließend passgenau zusammengeführt und miteinander verbunden werden, wobei auf die genaue Zuordnung der Schwächungslinie und der mit unterschiedlichen Klebstoffen beschichteten Flächen geachtet werden muss.Out EP 1 449 789 B1 is a packaging film is known, which can be torn along a line of weakness to release a strip-shaped adhesive surface. The exposed adhesive surface is used as a reclosure used. The packaging film consists of an inner film forming the inner side of the package, which is provided with a first line of weakness defining the tear opening, and an outer film having a second line of weakness. The two lines of weakness are laterally offset from each other, with the second line of weakness surrounding the first line of weakness. In a strip-shaped area between the two lines of weakness, the films are coated with a pressure-sensitive adhesive, for. As an acrylate adhesive, releasably connected. In the remaining area, the two films are covered by a permanent adhesive, for. B. on the basis of a PU adhesive, separating connected to each other. When the packaging film is torn open, the inner film is separated at the first weakening line and the outer film is separated at the second weakening line. Since the opening surface of the inner film is connected via the permanent adhesive with the outer film, the removal opening is released when lifting the film section. The reclosability results from the arrangement of the pressure-sensitive adhesive whose width corresponds to the distance between the first line of weakness and the second line of weakness. The process for producing the packaging films is expensive. First, the inner film is partially coated with pressure-sensitive adhesive, which is applied in a strip-shaped pattern. The coated film passes through a drying oven and is then provided in a subsequent cutting station with a line of weakness that surrounds the tear opening. To form the outer layer, a second film is provided, to which a permanent adhesive is also applied in a pattern. The coated film passes through a drying station and is also provided in a subsequent cutting station with a line of weakness, which form the second line of weakness of the packaging film. The film webs must then be accurately merged and joined together, with the exact Care must be taken to match the line of weakness and the areas coated with different adhesives.

Ferner ist in der Schrift WO 2008/115693 A1 ein Verfahren zur Herstellung wiederverschließbarer Öffnungen in Folien beschrieben, bei dem zunächst eine erste Folie zugeschnitten und mit Schwächungslinien versehen wird, in einem zweiten Schritt ein Haftkleber in einem Muster aufgetragen wird, danach ebenfalls in einem Muster Klebstoff für die permanente Laminierung aufgebracht wird, wonach die erste Folie mit einer zweiten Folie verbunden wird und schließlich auch die zweite Folie mit Schnitten und Schwächungslinien versehen wird.Furthermore, in the Scriptures WO 2008/115693 A1 describes a method for producing reclosable openings in films, in which first a first film is cut and provided with lines of weakness, in a second step, a pressure sensitive adhesive is applied in a pattern, then also in a pattern adhesive for permanent lamination is applied, after which first film is connected to a second film and finally the second film is provided with cuts and lines of weakness.

Durch EP 1 849 579 A1 ist ein Verfahren offenbart, um Aufreißverpackungen mit einer Schwächungslinie herzustellen. Dabei wird eine Schwächungslinie mittels Laserstrahl erzeugt.By EP 1 849 579 A1 For example, a method is disclosed for making tear-open packages having a line of weakness. In this case, a weakening line is generated by means of a laser beam.

Die US 2006/200107 A1 betrifft eine wiederverschließbare Verpackung für eine Mehrzahl von Wegwerfwindeln, deren Wiederverschließsystem mit der Umhüllung der Verpackung verbunden ist.The US 2006/200107 A1 relates to a resealable package for a plurality of disposable diapers whose reclosure system is associated with the wrapper of the package.

Vor diesem Hintergrund liegt der Erfindung das technologische Problem zugrunde, das Verfahren zur Herstellung einer mehrlagigen Verpackungsfolie, die entlang einer Schwächungslinie unter Freisetzen einer streifenförmigen Klebefläche aufgerissen werden kann, zu vereinfachen.Against this background, the invention is based on the technological problem of simplifying the process for producing a multilayer packaging film which can be torn open along a weakening line with the release of a strip-shaped adhesive surface.

Gegenstand der Erfindung und Lösung dieser Aufgabe ist ein Verfahren nach Anspruch 1. Bei dem erfindungsgemäßen Verfahren wird zunächst eine mehrschichtige Folie hergestellt, die eine Außenschicht, eine Siegelschicht für die Verpackungsinnenseite und zwischen den beiden Schichten eine zumindest einlagige Funktionsschicht aus einem Haftklebstoff aufweist. Durch Stanzen oder mittels einer Lasertechnik werden in die vorgefertigte Folie anschließend an der Folienoberseite und an der Folienunterseite Abschnitte der Schwächungslinie eingebracht, die zueinander seitlich versetzt sind und sich von der Folienoberseite oder der Folienunterseite jeweils bis zu der Funktionsschicht erstrecken. Der seitliche Versatz der von der Folienoberseite bzw. Folienunterseite ausgehenden Schwächungslinienabschnitte bestimmt die Breite des als Wiederverschluss verwendbaren klebrigen Streifens, der freigelegt wird, wenn die Verpackungsfolie entlang der Schwächungslinie aufgerissen wird. Die Schwächungslinie wird in einem Muster appliziert, das eine Aufreißlasche formt. Dabei ist der von der Siegelschicht ausgehende erste Abschnitt der Schwächungslinie von einem zweiten Schwächungslinienabschnitt, der von der gegenüberliegenden Seite der Folie ausgeht, umgeben.The invention and solution to this problem is a method according to claim 1. In the method according to the invention, a multilayer film is first prepared, which has an outer layer, a sealing layer for the packaging inside and between the two layers at least one having a single-layer functional layer of a pressure-sensitive adhesive. By punching or by means of a laser technology, sections of the weakening line are then introduced into the prefabricated film, subsequently to the upper side of the film and to the underside of the film, which are laterally offset from one another and extend from the upper side of the film or the lower side of the film to the functional layer. The lateral offset of the weakening line portions emanating from the film top or film bottom determines the width of the reusable sticky strip which is exposed when the packaging film is torn open along the line of weakness. The line of weakness is applied in a pattern that forms a tear tab. In this case, the first section of the weakening line emanating from the sealing layer is surrounded by a second weakening line section, which starts from the opposite side of the film.

Im Rahmen des erfindungsgemäßen Verfahrens ist wesentlich, dass die aus einem Haftklebstoff bestehende Funktionsschicht vollflächig zwischen benachbarten Folienlagen eingebracht bzw. angeordnet wird und sich ohne Unterbrechungen über die gesamte Länge und Breite der Verpackungsfolie erstreckt. Die von der Folienoberseite und Folienunterseite ausgehenden Schwächungslinienabschnitte erstrecken sich bis in den Bereich der Funktionsschicht und enden dort innerhalb der Funktionsschicht oder an einer Grenzfläche zwischen der Funktionsschicht und einer benachbarten Folienlage. Beim Aufreißen der Verpackungsfolie kommt es zu einer Rissausbreitung entlang der Schwächungslinienabschnitte, wobei sich der Riss innerhalb der Funktionsschicht oder an einer Grenzfläche zu einer benachbarten Folienlage kontrolliert fortsetzt. Dabei ist es nicht notwendig, innerhalb der Funktionsschicht Zonen mit unterschiedlichen Haftkräften vorzusehen. Als Haftklebstoff für die Funktionsschicht eignen sich insbesondere Acrylatkleber, SB-Copolymere (SBS, SIS, SEBS), Silikonkautschukklebstoffe, Naturkautschukklebstoffe, Polyisobutylen und EVA.In the context of the method according to the invention, it is essential that the functional layer consisting of a pressure-sensitive adhesive is introduced or arranged over its entire area between adjacent film layers and extends without interruptions over the entire length and width of the packaging film. The lines of weakness extending from the upper side of the film and lower side of the film extend into the region of the functional layer and end there within the functional layer or at an interface between the functional layer and an adjacent film layer. When the packaging film is torn open, crack propagation occurs along the weakening line sections, whereby the crack continues in a controlled manner within the functional layer or at an interface to an adjacent film layer. It is not necessary to provide zones with different adhesive forces within the functional layer. Suitable pressure-sensitive adhesives for the functional layer are, in particular, acrylate adhesives, SB copolymers (SBS, SIS, SEBS), silicone rubber adhesives, natural rubber adhesives, polyisobutylene and EVA.

Die mehrschichtige Folie kann aus einer Coextrusionsfolie bestehen, wobei die Außenschicht der Coextrusionsfolie bedruckt und mit einem Schutzlack beschichtet werden kann. In die bedruckte und mit dem Schutzlack versehene mehrschichtige Folie werden dann die Schwächungslinienabschnitte eingebracht. Die Siegelschicht und die Außenschicht der Coextrusionsfolie bestehen vorzugsweise aus Polyolefinschichten.The multilayer film can consist of a coextrusion film, wherein the outer layer of the coextrusion film can be printed and coated with a protective lacquer. In the printed and provided with the protective varnish multilayer film then the weakening line sections are introduced. The sealing layer and the outer layer of the coextruded film are preferably made of polyolefin layers.

Gemäß einer bevorzugten Ausführung der Erfindung wird eine mehrschichtige Folie hergestellt und verwendet, die zwischen der Außenschicht und der Siegelschicht eine Zwischenschicht aufweist, wobei die Funktionsschicht zwischen der Zwischenschicht und der Siegelschicht angeordnet ist. Die Zwischenschicht und die Siegelschicht bestehen vorzugsweise aus Polyolefinschichten.According to a preferred embodiment of the invention, a multilayer film is produced and used which has an intermediate layer between the outer layer and the sealing layer, wherein the functional layer is arranged between the intermediate layer and the sealing layer. The intermediate layer and the sealing layer are preferably made of polyolefin layers.

Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens werden in den Patentansprüchen 9 bis 17 beschrieben und im Folgenden anhand von Ausführungsbeispielen näher erläutert. Es zeigen schematisch:

Fig. 1
eine nach dem erfindungsgemäßen Verfahren hergestellte Verpackungsfolie im Gebrauch,
Fig. 2 bis 8
den Schichtenaufbau von Verpackungsfolien, die nach dem erfindungsgemäßen Verfahren hergestellt wurden.
Further advantageous embodiments of the method according to the invention are described in the claims 9 to 17 and explained in more detail below with reference to embodiments. They show schematically:
Fig. 1
a packaging film produced by the process according to the invention in use,
Fig. 2 to 8
the layer structure of packaging films, which were prepared by the process according to the invention.

Die Fig. 1 zeigt eine mehrlagige Verpackungsfolie, die entlang einer Schwächungslinie 1 unter Freisetzen einer streifenförmigen Klebefläche 2 aufgerissen werden kann. Die streifenförmige Klebefläche 2 ermöglicht einen Wiederverschluss der Folie.The Fig. 1 shows a multilayer packaging film which can be torn along a line of weakness 1 to release a strip-shaped adhesive surface 2. The strip-shaped adhesive surface 2 allows a reclosure of the film.

Zur Herstellung der Verpackungsfolie wird zunächst eine mehrschichtige Folie gefertigt, die gemäß den Darstellungen in Fig. 2 bis 8 eine als Verpackungsaußenseite geeignete und zumeist bedruckte Außenschicht 3, eine Siegelschicht 4 für die Verpackungsinnenseite und zwischen den beiden Schichten eine zumindest einlagige Funktionsschicht 6 aus einem Haftklebstoff 16 aufweist.To produce the packaging film, a multilayer film is first produced which, according to the illustrations in FIG Fig. 2 to 8 an outer layer 3 which is suitable as a packaging outside and is usually printed, a sealing layer 4 for the inside of the packaging and between the two layers has an at least single-layer functional layer 6 made of a pressure-sensitive adhesive 16.

Gemäß einem ersten, in Fig. 2 dargestellten Ausführungsbeispiel besteht die mehrschichtige Folie aus einer Coextrusionsfolie, deren Außenschicht 3 bedruckt und mit einem Schutzlack 18 beschichtet wird. Das Druckbild ist in der Fig. 2 als Farbschicht 7 schematisch dargestellt worden. Die Außenschicht 3 und die Siegelschicht 4 bestehen vorzugsweise aus polyolefinischen Schichten.According to a first, in Fig. 2 illustrated embodiment, the multilayer film of a co-extrusion film whose outer layer 3 is printed and coated with a protective lacquer 18. The print is in the Fig. 2 has been shown schematically as a color layer 7. The outer layer 3 and the sealing layer 4 are preferably made of polyolefinic layers.

In den Ausführungsbeispielen 3 bis 8 weist die mehrschichtige Folie zwischen der Außenschicht 3 und der Siegelschicht 4 eine Zwischenschicht 5 auf, die ebenso wie die Siegelschicht 4 vorzugsweise aus einer polyolefinischen Schicht besteht. Die Funktionsschicht 6 ist zwischen der Zwischenschicht 5 und der Siegelschicht 4 angeordnet. Die Außenschicht 3 kann beispielsweise aus einem Polyethylenterephthalat (PET), orientiertem Polypropylen (OPP, BOPP), orientiertem Polyamid (OPA) und dergleichen bestehen. Die Außenschicht 3 kann außenseitig bedruckt sein oder an der Innenseite invers bedruckt werden. Das Druckbild ist in den Fig. 2 bis 7 als Farbschicht 7 schematisch dargestellt worden. Als Außenschicht 3 kommt auch ein Schutzlack in Betracht. Die polyolefinischen Schichten 4, 5 bestehen beispielsweise aus Polyethylen oder Polypropylen. Für die Funktionsschicht 6 können als Haftklebstoff 16 Acrylatklebstoffe, Styrol-Butadien-Copolymere, Klebstoffe auf Basis eines Silikonkautschuks, Naturkautschuks sowie auch klebrige Polymere wie Polyisobutylen verwendet werden. Andere selbstklebende und dem Fachmann geläufige Klebharze sollen nicht ausgeschlossen sein.In the exemplary embodiments 3 to 8, the multilayer film between the outer layer 3 and the sealing layer 4 has an intermediate layer 5 which, like the sealing layer 4, preferably consists of a polyolefinic layer. The functional layer 6 is arranged between the intermediate layer 5 and the sealing layer 4. The outer layer 3 may be made of, for example, a polyethylene terephthalate (PET), oriented polypropylene (OPP, BOPP), oriented polyamide (OPA), and the like. The outer layer 3 may be printed on the outside or printed inversely on the inside. The print is in the Fig. 2 to 7 has been shown schematically as a color layer 7. As outer layer 3 is also a protective varnish into consideration. The polyolefinic layers 4, 5 consist for example of polyethylene or polypropylene. Acrylic adhesives, styrene-butadiene copolymers, adhesives based on a silicone rubber, natural rubber and also sticky polymers such as polyisobutylene can be used as the pressure-sensitive adhesive 16 for the functional layer 6. Other self-adhesive and familiar to the expert adhesive resins should not be excluded.

In den vorgefertigten Folienverbund werden durch Stanzen oder mittels einer Lasertechnik an der Folienoberseite und an der Folienunterseite Abschnitte der Schwächungslinie 1 eingebracht, die zueinander seitlich um das Maß a versetzt sind und sich von der Folienoberseite oder der Folienunterseite jeweils bis zu der Funktionsschicht 6 erstrecken. Der Darstellung in Fig. 1 entnimmt man, dass die Schwächungslinie 1 in einem Muster appliziert wird, die eine Aufreißlasche formt. Dabei ist ein von der Siegelschicht (Folienunterseite) ausgehender erste Abschnitt 9 der Schwächungslinie von einem zweiten Schwächungslinienabschnitt 9, der von der gegenüberliegenden Seite des Folienverbundes ausgeht, umgeben. Der Abstand a zwischen diesen beiden Schwächungslinienabschnitten 8, 9 definiert die Breite der Klebefläche 2, die beim Aufreißen der Verpackungsfolie freigesetzt wird.In the prefabricated composite film sections of the line of weakness 1 are introduced by punching or by means of a laser technology on the upper side of the film and on the underside of the film, which are laterally offset by the dimension a and extend from the top of the film or the film bottom to the functional layer 6. The representation in Fig. 1 if one deduces that the weakening line 1 is applied in a pattern which forms a tear-open tab. In this case, a first section 9 of the weakening line extending from the sealing layer (lower side of the film) is surrounded by a second weakening line section 9 which extends from the opposite side of the film composite. The distance a between these two weakening line sections 8, 9 defines the width of the adhesive surface 2 which is released when the packaging film is torn open.

Anhand des Schichtenaufbaus der in den Fig. 2 bis 8 dargestellten Verpackungsfolien werden im Folgenden diverse Verfahrensvarianten des erfindungsgemäßen Verfahrens erläutert.Based on the layer structure in the Fig. 2 to 8 illustrated packaging films are explained below various process variants of the method according to the invention.

Zur Herstellung der in Fig. 2 dargestellten Verpackungsfolie wird eine mehrschichtige Coextrusionsfolie 10 mit zwei polyolefinischen Schichten 3, 4 und einer zwischen diesen beiden Schichten angeordneten Funktionsschicht 6 aus einem Haftklebstoff 16 hergestellt. Die Außenschicht 3 der Coextrusionsfolie wird bedruckt (Farbschicht 7) und mit einem Schutzlack 18 beschichtet. In die bedruckte und mit dem Schutzlack 18 versehene mehrschichtige Folie werden anschließend Schwächungslinienabschnitte 8, 9 eingebracht, die sich von der Folienoberseite oder der Folienunterseite ausgehend jeweils bis zu der Funktionsschicht 6 erstreckt. Die Schwächungslinienabschnitte 8, 9 enden an der Grenzfläche zwischen der Funktionsschicht 6 und der die Verpackungsinnenseite bildenden Siegelschicht 4. Sie können auch innerhalb der Funktionsschicht 6 enden oder sich auch in vertikaler Richtung überlappen.For the production of in Fig. 2 A multi-layer coextrusion film 10 having two polyolefinic layers 3, 4 and a functional layer 6 arranged between these two layers of a pressure-sensitive adhesive 16 is produced. The outer layer 3 of the coextrusion film is printed (ink layer 7) and coated with a protective lacquer 18. In the printed and provided with the protective varnish 18 multi-layer film then weakening line sections 8, 9 are introduced, which extends from the top of the film or the film bottom, each extending to the functional layer 6. The weakening line sections 8, 9 terminate at the interface between the functional layer 6 and the inside of the package They can also end within the functional layer 6 or overlap in the vertical direction.

Zur Herstellung der in Fig. 3 dargestellten Verpackungsfolie wird ebenfalls eine Coextrusionsfolie 10 mit zwei polyolefinischen Schichten 4, 5 und einer zwischen den beiden Polyolefinschichten 4, 5 angeordneten Funktionsschicht 6 aus einem Haftklebstoff 16 hergestellt. Durch Aufkaschieren einer die Außenschicht 3 bildenden Folie 17 wird die Coextrusionsfolie 10 zu einem Folienverbund weiterverarbeitet, in den anschließend Schwächungslinienabschnitte 8, 9 eingebracht werden, die sich von der Folienoberseite oder der Folienunterseite ausgehend jeweils bis zu der Funktionsschicht 6 erstrecken. Gemäß der Darstellung in Fig. 3 enden die Schwächungslinienabschnitte 8, 9 an der Grenzfläche zwischen der Funktionsschicht 6 und der die Verpackungsinnenseite bildenden Siegelschicht 4. Die Schwächungslinienabschnitte 8, 9 können auch innerhalb der Funktionsschicht 6 enden oder sich auch in vertikaler Richtung überlappen. Im Rahmen der Erfindung liegt es beispielsweise, dass der in die Folienunterseite eingebrachte Schwächungslinienabschnitt 9 sich bis zur Grenzfläche zwischen der Funktionsschicht 6 und der polyolefinischen Zwischenschicht 5 erstreckt, während der von der Folienoberseite ausgehende Schwächungslinienabschnitt 8 entsprechend der Darstellung in Fig. 3 sich bis zur Grenzfläche zwischen der Funktionsschicht 6 und der unteren Siegelschicht 4 erstreckt. Die Außenfolie 17 ist im Ausführungsbeispiel an ihrer Innenseite invers bedruckt. Der inverse Aufdruck wurde als Farbschicht 7 dargestellt. Das anhand der Fig. 3 beschriebene Verfahren lässt sich besonders einfach durchführen und erfordert beispielsweise für die Applikation der Funktionsschicht 6 keine besonderen Applikationsanlagen.For the production of in Fig. 3 A coextrusion film 10 having two polyolefinic layers 4, 5 and a functional layer 6 of a pressure-sensitive adhesive 16 arranged between the two polyolefin layers 4, 5 is likewise produced. By laminating a film 17 forming the outer layer 3, the coextrusion film 10 is further processed into a film composite, into which weakening line sections 8, 9 are then introduced, which each extend from the upper side of the film or the underside of the film up to the functional layer 6. As shown in Fig. 3 The weakening line sections 8, 9 terminate at the interface between the functional layer 6 and the sealing layer 4 forming the packaging inside. The weakening line sections 8, 9 can also terminate within the functional layer 6 or can also overlap in the vertical direction. In the context of the invention, it is for example that the introduced in the film bottom weakening line section 9 extends to the interface between the functional layer 6 and the polyolefinic intermediate layer 5, while the outgoing from the film top weakening line section 8 as shown in FIG Fig. 3 extends to the interface between the functional layer 6 and the lower sealing layer 4. The outer film 17 is printed on the inside inverse in the embodiment. The inverse imprint was shown as a color layer 7. That on the basis of Fig. 3 described method can be carried out particularly easily and requires, for example, for the application of the functional layer 6 no special application equipment.

Zur Fertigung der in Fig. 4 dargestellten Verpackungsfolie wird zunächst durch Blasfolienextrusion ein mindestens zweischichtiger Folienschlauch hergestellt, der eine äußere polyolefinische Schicht und eine Innenschicht aus einem Haftklebstoff 16 bzw. einem Polymer mit klebrigen Eigenschaften aufweist. Die Innenschicht des Folienschlauches besteht beispielsweise aus Metallocen-PE, d. h. einem unter Verwendung von Metallocen-Katalysatoren hergestellten Polyethylen, oder EVA. Der Folienschlauch wird zu einer mehrlagigen Flachfolie 11 zusammengelegt, die äußere polyolefinische Schichten 4, 5 sowie eine aus Haftklebstoff 16 bestehende zweilagige Funktionsschicht 6 aufweist. Die Flachfolie 11 wird durch Aufkaschieren einer die Außenschicht 3 bildenden Folie 17 zu einem Folienverbund weiterverarbeitet, in den anschließend die Schwächungslinienabschnitte 8, 9 eingebracht werden, die sich von der Folienunterseite oder der Folienoberseite ausgehend jeweils bis zu der Funktionsschicht 6 erstrecken. Die Schwächungslinienabschnitte 8, 9 enden innerhalb der Funktionsschicht 6, vorzugsweise an der durch Flachlegen des Folienschlauches gebildeten Grenzfläche. Die Außenfolie 17, die beispielsweise aus PET oder BOPP bestehen kann, kann außenseitig bedruckt werden. Im Ausführungsbeispiel wurde die aufzukaschierende Folie 17 an ihrer der mehrlagigen Flachfolie 11 zugewandten Innenfläche invers bedruckt. Das Druckbild ist schematisch als Farbschicht 7 dargestellt.For the production of in Fig. 4 illustrated packaging film is first produced by blown film extrusion at least a two-layer film tube, having an outer polyolefinic layer and an inner layer of a pressure-sensitive adhesive 16 or a polymer having tacky properties. The inner layer of the film tube consists for example of metallocene PE, ie a polyethylene produced using metallocene catalysts, or EVA. The film tube is folded together to form a multilayer flat film 11 which has outer polyolefinic layers 4, 5 as well as a two-layer functional layer 6 consisting of pressure-sensitive adhesive 16. The flat film 11 is further processed by laminating a film 17 forming the outer layer 3 to form a film composite into which the weakening line sections 8, 9 are then introduced, which each extend from the lower side of the film or the upper side of the film to the functional layer 6. The weakening line sections 8, 9 terminate within the functional layer 6, preferably at the interface formed by laying flat of the film tube. The outer film 17, which may consist of PET or BOPP, for example, can be printed on the outside. In the exemplary embodiment, the film 17 to be laminated has been printed inversely on its inner surface facing the multilayer flat film 11. The printed image is shown schematically as a color layer 7.

Das Aufreißverhalten der Verpackungsfolie kann noch verbessert werden, wenn auf eine an die Funktionsschicht 6 angrenzende Folienoberfläche Streifen aus einem Dehäsivlack 12 in einem an den Verlauf der später erzeugten Schwächungslinie 1 angepassten Muster aufgedruckt werden. Als Dehäsivlack, der in der Praxis auch als Releaselack bezeichnet wird, können PA-Systeme, 2K-Acrylat-Systeme, Silikon und PVC-Systeme verwendet werden. Die Applikation des Dehäsivlacks 12 kann im Rahmen des erfindungsgemäßen Verfahrens auf verschiedene Weise berücksichtigt werden. Die Methoden werden im Folgenden anhand der Fig. 5 bis 8 erläutert.The tearing behavior of the packaging film can be further improved if strips of a diene finish 12 are printed on a film surface adjoining the functional layer 6 in a pattern adapted to the course of the subsequently produced weakening line 1. As a Dehäsivlack, which is also referred to in practice as a release liner, PA systems, 2K-acrylate systems, silicone and PVC systems can be used. The application of the Dehäsivlacks 12 can be considered in the context of the method according to the invention in various ways. The methods are described below on the basis of Fig. 5 to 8 explained.

Zur Herstellung der in Fig. 5 dargestellten Verpackungsfolie werden zunächst zwei Coextrusionsfolien 13, 13' hergestellt, die an ihrer einen Seite eine siegelfähige Polyolefinschicht 4, 5 und an ihrer anderen Seite eine Schicht aus einem die Funktionsschicht 6 bildenden Haftklebstoff 16 aufweisen. Auf eine der beiden Coextrusionsfolien 13, 13' werden Streifen aus einem Dehäsivlack 12 in einem Muster aufgedruckt, das an den Verlauf der später erzeugten Schwächungslinie 1 angepasst ist. Die Applikation des Dehäsivlacks 12 erfolgt dabei auf die aus dem Haftklebstoff 16 bestehende Schicht der ausgewählten Coextrusionsfolie 13, 13'. Die Coextrusionsfolien 13, 13'werden anschließend zu einem Laminat 14 verbunden, das Polyolefinschichten 4, 5 sowie eine doppellagige Funktionsschicht 6 aus Haftklebstoff aufweist. In die Funktionsschicht 6 sind dabei Zonen eingelagert, die aus dem Dehäsivlack 12 bestehen und die Verbundfestigkeit zwischen den beiden Klebstofflagen 6, 6' lokal reduzieren. Das Laminat 14 wird durch Aufkaschieren einer die Außenschicht 3 bildenden Folie 17 zu einem Folienverbund weiterverarbeitet, in den anschließend die Schwächungslinienabschnitte 8, 9 eingebracht werden, die sich von der Folienoberseite oder der Folienunterseite ausgehend jeweils bis zu der Funktionsschicht 6 erstrecken. Der Darstellung in Fig. 5 entnimmt man, dass die von der Folienoberseite und der Folienunterseite ausgehenden Abschnitte 8, 9 der Schwächungslinie 1 zueinander so versetzt werden, dass die Schwächungslinienabschnitte 8, 9 im Wesentlichen an die Ränder der aus dem Dehäsivlack 12 bestehenden Streifen angrenzen.For the production of in Fig. 5 2, two coextrusion films 13, 13 'are produced, which have on their one side a sealable polyolefin layer 4, 5 and on their other side a layer of a functional adhesive 6 forming the functional layer 6. On one of the two coextrusion films 13, 13 'strips of a Dehäsivlack 12 are printed in a pattern that is adapted to the course of the weakening line 1 generated later. The application of the adhesive varnish 12 takes place on the existing of the pressure-sensitive adhesive 16 layer of the selected coextrusion film 13, 13 '. The coextrusion films 13, 13 'are subsequently joined to form a laminate 14, which has polyolefin layers 4, 5 as well as a double-layered functional layer 6 of pressure-sensitive adhesive. In the functional layer 6 while zones are incorporated, which consist of the Dehäsivlack 12 and reduce the bond strength between the two adhesive layers 6, 6 'locally. The laminate 14 is further processed by laminating a film 17 forming the outer layer 3 to form a film composite into which the weakening line sections 8, 9 are then introduced, which each extend from the upper side of the film or the lower side of the film to the functional layer 6. The representation in Fig. 5 If one assumes that the outgoing of the film top and the film bottom portions 8, 9 of the weakening line 1 to each other so that the weakening line sections 8, 9 are substantially adjacent to the edges of the existing of the Dehäsivlack 12 strips.

Zur Fertigung der in Fig. 6 dargestellten Verpackungsfolie wird durch Co-extrusion oder in einem Kaschierverfahren ein zumindest zweilagiges Folienmaterial 15 hergestellt, welches an seiner einen Seite eine Polyolefinschicht 5 und an seiner anderen Seite eine als Verpackungsaußenseite geeignete Außenschicht 3 aufweist. Auf die Polyolefinschicht 5 des Folienmaterials 15 wird unter Verwendung eines flächig aufgetragenen Haftklebstoffes 16 anschließend eine polyolefinische Siegelfolie 4 aufkaschiert, wobei auf die Innenseite der Siegelfolie 4 oder auf die Polyolefinschicht 5 des Folienmaterials 15 vor dem Kaschierprozess Streifen aus einem Dehäsivlack 12 aufgedruckt werden. Der Dehäsivlack 12 wird dabei in einem Muster appliziert, das an den Verlauf der später erzeugten Schwächungslinie 1 angepasst ist. In den nach dem beschriebenen Verfahren hergestellten Folienverbund, der mindestens vier Schichten umfasst, werden anschließend die Schwächungslinienabschnitte 8, 9 eingebracht, die sich jeweils von der Folienoberseite oder der Folienunterseite ausgehend bis zu dem die Funktionsschicht 6 bildenden Haftklebstoff 16 erstrecken. Die von der Folienoberseite und der Folienunterseite ausgehenden Abschnitte der Schwächungslinie 1 werden so versetzt, dass die Abschnitte 8, 9 der Schwächungslinie 1 im Wesentlichen an die Ränder der aus dem Dehäsivlack 12 bestehenden Streifen angrenzen.For the production of in Fig. 6 illustrated packaging film is prepared by coextrusion or in a laminating at least two-ply film material 15 having on one side of a polyolefin layer 5 and on its other side an outer side suitable as a packaging outer side 3. On the polyolefin layer 5 of the film material 15 is then using a two-dimensionally applied pressure-sensitive adhesive 16 laminated on a polyolefinic sealing film 4, wherein on the inside of the sealing film 4 or on the polyolefin layer 5 of the film material 15 prior to the laminating strips of a Dehäsivlack 12 are printed. The Dehäsivlack 12 is applied in a pattern that is adapted to the course of the weakening line 1 generated later. In the film composite produced by the described method, which comprises at least four layers, then the weakening line sections 8, 9 are introduced, which extend starting from the upper side of the film or the lower side of the film up to the pressure-sensitive adhesive 16 forming the functional layer 6. The portions of the weakening line 1 emanating from the upper side of the film and the underside of the film are offset so that the sections 8, 9 of the weakening line 1 are substantially adjacent to the edges of the strips consisting of the adhesive enamel 12.

Die in Fig. 6 dargestellte Folie ist an der Außenseite der oberen, z. B. aus PET oder BOPP bestehenden Außenschicht 3 bedruckt. Gemäß der Darstellung in Fig. 7 kann der als Farbschicht 7 dargestellte Aufdruck jedoch auch an der Innenseite der die Außenschicht 3 bildenden Folie 17 als inversives Druckbild aufgebracht werden. Gemäß der Darstellung in Fig. 8 besteht schließlich auch die Möglichkeit, dass die Siegelfolie 4 an ihrer der Funktionsschicht 6 zugewandten Innenseite bedruckt wird.In the Fig. 6 shown film is on the outside of the upper, z. B. made of PET or BOPP existing outer layer 3 printed. As shown in Fig. 7 However, the print shown as ink layer 7 can also be applied to the inside of the outer layer 3 forming film 17 as an inverse printed image. As shown in Fig. 8 Finally, there is also the possibility that the sealing film 4 is printed on its inner side facing the functional layer 6.

Claims (17)

  1. A method for producing a multi-layer packaging film which can be torn open along a tear line (1), thereby exposing a strip-shaped adhesive surface (2),
    wherein initially a multi-layer film is produced, which comprises an outer layer (3), a sealing layer (4) for the inside of the packaging and a function layer (6) from an adhesive (16) comprising at least one single-layer between the two layers,
    wherein the function layer (6) consisting of the adhesive (16) is arranged full-surface between adjacent film layers and extends uninterruptedly across the entire length and width of the packaging film,
    wherein sections (8, 9) of the tear line (1) are provided subsequently in the prefabricated film on its topside and its underside by means of punching or by means of a laser technique, wherein the sections extending from the film topside and the film underside are laterally offset from one another, extending respectively from the film topside or the film underside as far as the function layer (6) and ending there within the function layer (6) or at a boundary surface between the function layer and an adjacent film layer.
  2. The method according to claim 1, characterised in that the tear line (1) is applied in a pattern, which forms a pull tab, wherein a first section (9) of the tear line (1) extending from the sealing layer (4) is surrounded by a second tear line section (8), which extends from the opposite side of the film composite.
  3. The method according to claim 1 or 2, characterised in that the adhesive (16) consists of an acrylate adhesive, a styrene butadiene (SB) copolymer, an adhesive based on a silicon rubber, natural rubber or poly-isobutylene (PIB) or EVA.
  4. The method according to one of claims 1 to 3, characterised in that the multilayer film consists of a co-extrusion film.
  5. The method according to claim 4, characterised in that the outer layer (3) of the co-extrusion film is imprinted and covered with a protective varnish (18) and that the tear line sections (8, 9) are provided in the multilayer imprinted film provided with the protective varnish (18).
  6. The method according to claim 4 or 5, characterised in that the outer layer of the co-extrusion film and the sealing layer (4) consist of polyolefin-based layers.
  7. The method according to one of claims 1 to 3, characterised in that the multilayer film between the outer layer (3) and the sealing layer (4) has an intermediate layer (5), wherein the function layer (6) is arranged between the intermediate layer (5) and the sealing layer (4).
  8. The method according to claim 7, characterised in that the intermediate layer (5) and the sealing layer (4) consist of polyolefin layers.
  9. The method according to one of claims 1 to 3, characterised in that a co-extrusion film (10) is manufactured with two polyolefin-based layers (4, 5) and a functional layer from an adhesive (16) arranged between the two polyolefin layers (4, 5) and further processed to form a film composite by laminating a film (17) forming the outer layer (3) onto it, in which subsequently the tear line sections (8, 9) are provided.
  10. The method according to one of claims 1 to 3, characterised in that an at least two-layer film tube is produced by blown film extrusion, which comprises an outer polyolefin layer and an inner layer from an adhesive (16), in that the film tube is folded up to form a multilayer flat film (11), which comprises polyolefin layers (4, 5) as well as a two-layer function layer (6) consisting of adhesive (16) and in that the flat film (11) is further processed to form a film composite by laminating a film (17) forming the outer layer (3) onto it, in which subsequently the tear line sections (8, 9) are provided.
  11. The method according to claim 9 or 10, characterised in that the film to be laminated-on is inversely imprinted on its inner surface facing the co-extrusion film (10) or multilayer flat film (11).
  12. The method according to one of claims 1 to 3, characterised in that strips of a dehesive varnish (12) are applied to a film surface bordering the function layer (6) in a pattern, which is adapted to suit the progression of the tear line (1) to be produced later.
  13. The method according to claim 12, characterised in that two co-extrusion films (13, 13') are produced, which on one side comprise a sealable polyolefin layer (4, 5) and on the other side a layer from an adhesive (16), in that strips of a dehesive varnish (12) are printed onto the adhesive layer consisting of an adhesive (16) of one of the two co-extrusion films (13, 13') in a pattern adapted to the progression of the tear line (1) to be produced later, in that the co-extrusion films (13, 13') are combined to form a laminate (14) which comprises a double-walled function layer (6) from an adhesive (16) and polyolefin-based layers (4, 5), and in that the laminate (14) is further processed by laminating a film (17) forming the outer layer (3) onto it in order to form a film composite, in which subsequently the tear line sections (8, 9) are provided, wherein the sections (8, 9) of the tear line (1) extending from the film topside and the film underside are offset from one another in such a way that the tear line sections (8, 9) essentially border the edges of the strips consisting of a dehesive varnish (12).
  14. The method according to claim 13, characterised in that an at least two-layer film material (15) is produced by co-extrusion or in a laminating process, which on its one side comprises a polyolefin layer (5) and on its other side an outer layer (3) suitable as the outside of a packaging, in that a sealing film (4) is laminated onto the polyolefin layer (5) by means of an areally applied adhesive (16), wherein prior to the laminating process strips of a dehesive varnish (12) are applied to the inside of the sealing film (4) or the polyolefin layer (5) of the film material (15) in a pattern adapted to the progression of the tear line (1) to be produced later and in that subsequently the tear line sections (8, 9) are provided in the resulting film composite, wherein the tear line sections (8, 9) extending from the film topside and the film underside are offset from one another such that the sections of the tear lines essentially border the edges of the strips consisting of a dehesive varnish (12).
  15. The method according to claim 14, characterised in that the outer layer (3) of the film material (15) consists of a film (17), which is inversely imprinted on the inside.
  16. The method according to claim 14, characterised in that the outer layer (3) of the film composite is imprinted before the tear line sections (8, 9) are provided in the film composite.
  17. The method according to claim 14, characterised in that the sealing film (4) is imprinted on its inside facing the function layer (6).
EP10004045.0A 2010-04-16 2010-04-16 Method for producing a multi-layer packaging film Not-in-force EP2377682B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES10004045.0T ES2643553T3 (en) 2010-04-16 2010-04-16 Manufacturing procedure of a multilaminar packaging film
EP10004045.0A EP2377682B1 (en) 2010-04-16 2010-04-16 Method for producing a multi-layer packaging film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10004045.0A EP2377682B1 (en) 2010-04-16 2010-04-16 Method for producing a multi-layer packaging film

Publications (2)

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EP2377682A1 EP2377682A1 (en) 2011-10-19
EP2377682B1 true EP2377682B1 (en) 2017-08-30

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2503738A (en) * 2012-07-06 2014-01-08 Parkside Flexibles Europ Ltd Laminate for forming a package
GB201216087D0 (en) * 2012-09-10 2012-10-24 Parkside Flexibles Europ Ltd Laminate closures

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU536262B2 (en) 1979-12-03 1984-05-03 Kenji Nakamura Resealable dispenser container
ITTO940795A1 (en) 1994-10-07 1996-04-07 P & G Spa SEALABLE PACKAGE
EP1449789B1 (en) * 2003-02-19 2007-08-08 Alcan Technology & Management Ltd. Packaging container comprising a packaging foil having an integral system for opening and re-closing
US7262335B2 (en) * 2005-03-07 2007-08-28 The Procter & Gamble Company Easy-open, re-closable package for disposable diapers
EP1849579A1 (en) * 2006-04-26 2007-10-31 Nordenia Deutschland Halle GmbH Werk Steinfeld Method for manufacturing a film for tearable packagings
WO2008115693A1 (en) * 2007-03-21 2008-09-25 Wm. Wrigley, Jr. Company Method for making a flexible reclosable package

Non-Patent Citations (1)

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EP2377682A1 (en) 2011-10-19

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